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EventLog.Exists Method (String)

.NET Framework 4.5

Determines whether the log exists on the local computer.

Namespace: System.Diagnostics
Assembly: System (in System.dll)

public static bool Exists(
	string logName
)

Parameters

logName: Type: System.String
The name of the log to search for. Possible values include: Application, Security, System, other application-specific logs (such as those associated with Active Directory), or any custom log on the computer.

Return Value

Type: System.Boolean
true if the log exists on the local computer; otherwise, false.

Exceptions

Exception	Condition
ArgumentException	The logName is null or the value is empty.

Remarks

Use this method to determine if a log exists on the local computer. If you want to determine whether a source exists on the local computer, use SourceExists.

Because this method accesses the registry, you must have the appropriate registry permissions on the local computer; otherwise, the query returns false.

Because you cannot give a new log the name of an existing log on the same computer, use this method before creating a new log to determine if the specified logName already exists on the local computer. The logName parameter is not case sensitive.

Exists is a static method, so it can be called on the class itself. It is not necessary to create an instance of EventLog to call Exists.

Examples

C++

string myLog = "myNewLog";
if (EventLog.Exists(myLog))
{
   Console.WriteLine("Log '"+myLog+"' exists.");
}
else
{
   Console.WriteLine("Log '"+myLog+"' does not exist.");
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET Framework Security

EventLogPermission
for administering event log information on the computer. Associated enumeration: EventLogPermissionAccess.Administer

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

EventLog Class

Exists Overload

System.Diagnostics Namespace

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